1 Human development is the scientific study of processes of change and stability.  The scientific study of human development began with studies of childhood during the nineteenth century.
verb (used with object), cultivated, cultivating. 1. to prepare and work on (land) in order to raise crops; till. 2. to use a cultivator on. 3. to promote or improve the growth of (a plant, crop, etc.) by labor and attention.
A cultigen (from the Latin cultus â cultivated, and gens â kind) is a plant that has been deliberately altered or selected by humans; it is the result of artificial selection. These man-made or anthropogenic plants are, for the most part, plants of commerce that are used in horticulture, agriculture and forestry.